Do most of those commenting here actually have the budget for either of these? I feel like I have slipped back a few years to when AMD was releasing expensive cards barely anyone cared about. Having the fastest card doesn't really matter if it costs too much. The real relevance that AMD had discovered once upon a time was to have a very good offering at a reasonable price. They put out cards in the 200 to 400 range that were their fastest single GPU cards and we relevant. Their higher end cards at those times were then dual GPU cards, now... the new offering with the new tech after 2 years of nothing... is at the price of a dual GPU card. I really don't think we should care and I guess many don't besides curiousity on the full details. Beyond that... I'll just forget the r9 290x exists similar to my not giving a damn about the gtx 780/770 and titan.
Either of the companies can put out the fastest card. They could put out a severely over-clocked r9 290x and call it r9 2uber90x priced at $2000 if they wanted (the titan was something like this). At some point the price should make the card irrelevant to the majority of gamers.